Abstract
The quasifree reaction has been measured by means of collisions at using the WASA detector setup at COSY enabling exclusive and kinematically complete measurements. Total and differential cross sections have been extracted for the energy region GeV () covering thus the regions of and resonance excitations. Calculations describing these excitations by -channel meson exchange as well as isospin relations based on the data underpredict substantially the measured total cross section. The calculations are also at variance with specific experimental differential cross sections. An isotensor dibaryon resonance with produced associatedly with a pion is able to overcome these deficiencies. Such a dibaryon was predicted by Dyson and Xuong [Phys. Rev. Lett. 13, 815 (1964)] and more recently calculated by A. Gal and H. Garcilazo [Nucl. Phys. A 928, 73 (2014)].
5 More- Received 13 August 2018
DOI:https://doi.org/10.1103/PhysRevC.99.025201
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